/*
 * Copyright 2010 david varnes.
 *
 * Licensed under the Apache License, version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.freeswitch.esl.client.inbound;

import org.freeswitch.esl.client.internal.debug.ExecutionHandler;
import org.freeswitch.esl.client.transport.message.EslFrameDecoder;
import org.jboss.netty.channel.ChannelHandler;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.handler.codec.string.StringEncoder;
import org.jboss.netty.handler.execution.OrderedMemoryAwareThreadPoolExecutor;

/**
 * End users of the {@link Client} should not need to use this class.
 * <p>
 * Convenience factory to assemble a Netty processing pipeline for inbound clients.
 *
 * @author david varnes
 */
public class InboundPipelineFactory implements ChannelPipelineFactory {
    private final ChannelHandler handler;

    public InboundPipelineFactory(ChannelHandler handler) {
        this.handler = handler;
    }

    public ChannelPipeline getPipeline() throws Exception {
        ChannelPipeline pipeline = Channels.pipeline();
        pipeline.addLast("encoder", new StringEncoder());
        pipeline.addLast("decoder", new EslFrameDecoder(8192));
        // Add an executor to ensure separate thread for each upstream message from here
        pipeline.addLast("executor", new ExecutionHandler(
                new OrderedMemoryAwareThreadPoolExecutor(16, 1048576, 1048576)));

        // now the inbound client logic
        pipeline.addLast("clientHandler", handler);

        return pipeline;
    }
}
